超越自然界所能产生的分子多样性的扩展是化学科学的基本目标。尽管含硼杂环的化学性质很丰富,但以六元B 3 NO 2核为特征的1,3-二氧杂-5-氮杂-2,4,6-三硼烷(DATB)环系统仍然难以捉摸。在这里,我们报告m的合成-三联苯基为模板的DATB衍生物,由于三个适当排列的硼原子而显示出高稳定性和奇特的Lewis酸度。我们确定了羧酸和胺的脱水酰胺化中DATB的特殊用途,该反应具有很高的学术和工业重要性。与先前报道的催化剂和酰胺偶联剂的作用机理相反,提出了三个硼位参与底物组装,降低了过渡态的熵成本。由DATB核心决定的独特的机理途径不仅会促进这种酰胺化反应,还会促进由多位点激活引起的其他反应。
DATB derivatives, displaying high stability and peculiar Lewis acidity arising from the three suitably arranged boron atoms. We identify a particular utility for DATB in the dehydrative amidation of carboxylic acids and amines, a reaction of high academic and industrial importance. The three boron sites are proposed to engage in substrate assembly, lowering the entropic cost of the transition state,
超越自然界所能产生的分子多样性的扩展是化学科学的基本目标。尽管含硼杂环的化学性质很丰富,但以六元B 3 NO 2核为特征的1,3-二氧杂-5-氮杂-2,4,6-三硼烷(DATB)环系统仍然难以捉摸。在这里,我们报告m的合成-三联苯基为模板的DATB衍生物,由于三个适当排列的硼原子而显示出高稳定性和奇特的Lewis酸度。我们确定了羧酸和胺的脱水酰胺化中DATB的特殊用途,该反应具有很高的学术和工业重要性。与先前报道的催化剂和酰胺偶联剂的作用机理相反,提出了三个硼位参与底物组装,降低了过渡态的熵成本。由DATB核心决定的独特的机理途径不仅会促进这种酰胺化反应,还会促进由多位点激活引起的其他反应。
Visible light photoredox catalysed amidation of carboxylic acids with amines
作者:Vishal Srivastava、Pravin K. Singh、Praveen P. Singh
DOI:10.1016/j.tetlet.2018.11.050
日期:2019.1
A visible-light promoted photoredox catalysed, green one-pot approach for the amidation of carboxylic acids with amines has been developed for the synthesis of diverse aliphatic and aromatic amides. The proposed strategy is extendable also to biologically active amides and could represent a low-cost alternative to the common synthetic pathways. The developed strategy may hold great potential for a